Bursian A V, Timofeeva O P
Zh Evol Biokhim Fiziol. 1990 Jan-Feb;26(1):85-91.
The cyclic variations of the motor activity consist of many rhythmic components which appear nonsimultaneously in the ontogenesis. The earliest component is the autogenic periodic motility with the duration about one minute which can be observed in rats during first two-three weeks after the birth. From the second week a new type of cyclic activity appears. It can be qualified as a sleep-wakefulness cycle with the duration about several minutes. It is suggested that this cycle is a true novel rhythm which is able to modulate the earliest more frequent periodicity.
运动活动的周期性变化由许多节律性成分组成，这些成分在个体发育过程中并非同时出现。最早的成分是自生周期性运动，持续时间约为一分钟，在出生后的头两到三周的大鼠中可以观察到。从第二周开始，出现了一种新的周期性活动类型。它可以被认为是一个持续约几分钟的睡眠-觉醒周期。有人认为，这个周期是一种真正的新节律，能够调节最早出现的更频繁的周期性。
